Day 242

Thursday (already).  Totally slept away yesterday.  The medicine is probably messing with my system.


1204.3327
Satellite survival in highly resolved milky way class halos
Geen, Slyz, Devriendt


MW-scale AMR hydro simulation with 50pc resolution to see the survival of satellites, study the effects of UV photoionization, SNe feedback, and interaction with larger host halo.  Find: SNe feedback reduces SF in the least massive satellites but enhances it in the more massive ones. Photoioiniszation appears to play a very minor role in suppressing star and galaxy formation in all progenitors of satellite halos.  The largest effect on the satellite population is found to be the mass of the host and whether gas cooling is included in the simulation or not.  Inclusion of gas cooling reduces the number of satellites captured at high z which survive down to z=0.


1204.3345
Second order solutions of cosmological perturbation n the matter dominated era
Hwang, Noh, Gong


Growing mode solutions of cosmological perturbations to the second order in matter dominated era: study the Newtonian correspondence of relativistic perturbations to the second order.  In the sub-horizon limit, have the correspondences for density, velocity and potential perturbations in the zero-shear gauge and in the uniform-expansion gauge to the second order.  Identify the relativistic gravitational potential which shows exact correspondence to the Newtonian one to the second order.


12024.3356
Spectroscopic evidence of charge exchange X-ray emission from galaxies
Wang, Liu


As the title says.  Some soft-xray emission is probably not due to plasma, but due to neutral charge exchange.  Alternative scenarios (resonance scattering by plasma and relic photo-ionization by AGN) cannot be ruled out.


1204.3377
Missing dark matter in the local universe
Karachentsev


Study features of the local distribution of luminous (stellar) and DM within a sphere of radius of 50Mpc around us, with a sample of 11k galaxies with V_LG<3500 km/s.  Avg Omega_m locally is lower than global cosmic density (0.08 vs 0.28) [how did they measure this?].  Possibly because (i) DM dominance outside virial radii, (ii) we are in a local void, (iii) the bulk of matter in the universe is not related to clusters and groups.


1204.3426
Evidence for low extinction in actively star forming galaxies at z>6.5
Walter, Decarli, ... Bertoldi, ..  Cox, Egami, Nakanishi, etal


Study two LAEs at z=6.6 and 7.0 and one GRB host galaxy at z8.8, with FIR continuum.  Low obscuration in z>6 LAE compared to lower redshift (2<z<3.5) with similar UV-based SFRs.


1204.3490
Scale dependence of the halo bias in general local-type non-gaussian models I: analytical predictions and consistency relations
Nishimichi


Investigate clustering of haloes in cosmological models with general local-type non-Gaussian primordial fluctuations.  Employ multiple Gaussian fields and add local-type non-Gaussian corrections at arbitrary order to cover a class of models frequently described by f_nl, g_nl and tau_nl parameterizations.  Derive a general formula for the halo power spectrum based on the peak-background split formalism.